Write additional tests (#22802)

* Write additional tests

* Make Sonar happier

test/unit-tests/vector/platform/PWAPlatform-test.ts

@@ -0,0 +1,33 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import PWAPlatform from "../../../../src/vector/platform/PWAPlatform";
+
+describe('PWAPlatform', () => {
+    beforeEach(() => {
+        jest.clearAllMocks();
+    });
+
+    describe("setNotificationCount", () => {
+        it("should call Navigator::setAppBadge", () => {
+            navigator.setAppBadge = jest.fn().mockResolvedValue(undefined);
+            const platform = new PWAPlatform();
+            expect(navigator.setAppBadge).not.toHaveBeenCalled();
+            platform.setNotificationCount(123);
+            expect(navigator.setAppBadge).toHaveBeenCalledWith(123);
+        });
+    });
+});